/Engine/Source/Editor/Kismet/Public/BlueprintNamespaceHelper.h
A class viewer filter that can be used with class picker widgets to filter out class types whose namespaces were not imported into the Blueprint editor context that's managed by this instance.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IClassViewerFilter](API\Editor\ClassViewer\IClassViewerFilter) > GetClassViewerFilter() const